1 Australian Centre for Precision Agriculture, Faculty of Agriculture, Food & Natural Resources, McMillan Building A05, The University of Sydney, NSW 2006, www.agric.usyd.edu.au/acpa/ Email Alex.McBratney@acss.usyd.edu.au
2 Embrapa Solos, Rua Jardim Botânico 1024, 22.460-000 Rio de Janeiro, RJ, Brazil, www.cnps.embrapa.br Email loumendonca@cnps.embrapa.br
3 Australian Centre for Precision Agriculture, Faculty of Agriculture, Food & Natural Resources, McMillan Building A05, The University of Sydney, NSW 2006, www.agric.usyd.edu.au/acpa/ Email budiman@acss.usyd.edu.au
4 Australian Cotton CRC, Faculty of Agriculture, Food & Natural Resources, Ross St Building A03, The University of Sydney, cotton.crc.org.au// Email johnt@acss.usyd.edu.au Currently, School of Biological Earth & Environmental Sciences, Biosciences Building, University of New South Wales, NSW 2052, www.bees.unsw.edu.au Email j.triantafilis@unsw.edu.au
5 Australian Cotton CRC, Faculty of Agriculture, Food & Natural Resources, Ross St Building A03, The University of Sydney, NSW 2006, cotton.crc.org.au/ Email i.odeh@acss.usyd.edu.au
A set of new digital soil maps with a resolution of 25 m is being prepared for the 1:50 000 Edgeroi map sheet in north-west NSW. The original detailed profile description and laboratory analysis was funded by a Cotton Research & Development Corporation project in the mid-late 1980’s by the CSIRO Division of Soils (McGarry et al. 1989). This is one of the best quantitative extensive soil data sets in Australia because of, (i) the large amount of laboratory data and, (ii) the grid sampling on an equilateral triangular grid with local modifications. As such it is a good testbed for digital soil mapping techniques. A preliminary quantitative analysis was made by Triantafilis and McBratney (1993) but no formal mapping was done. Digital soil maps of soil classes according to the Australian Soil Classification system and of various useful soil properties are being prepared using a variety of methods based on the scorpan-SSPF approach outlined in McBratney et al. (2003). A comparison of methods and the resulting maps will be presented.
References
McBratney AB, Mendonça Santos ML, Minasny, B (2003) On digital soil mapping. Geoderma 117, 3-52.
McGarry D, Ward WT, McBratney AB (1989) Soil Studies in the Lower Namoi Valley: Methods and Data. The Edgeroi Data Set. (2 vols) (CSIRO Division of Soils: Adelaide).
Triantafilis J, McBratney AB (1993) Application of Continuous methods of Soil Classification and Land Suitability Assessment in the Lower Namoi Valley. Divisional Report No 121. (CSIRO Division of Soils: Adelaide).
